public class HelloWorld {
  public static void main(String[] args) {

    System.out.println("Hello World!");

//        char只能写一个字符
    char c1 = 'a';
    System.out.println(c1);
//        转义字符
    char c5 = '\n';
    System.out.print("hello" + c5);
    System.out.println("world");
    c5 = '\t';
    System.out.print("hello" + c5);
    System.out.println("world");

  }
}
